Testing the asymptotic relation for period spacings from mixed modes of red giants observed with the Kepler missionB. Buysschaert, P. G. Beck, E. Corsaro, J. Christensen-Dalsgaard, C. Aerts, T. Arentoft, H. Kjeldsen, R. A. García, V. Silva Aguirre and P. DegrooteA&A, 588 (2016) A82DOI: https://doi.org/10.1051/0004-6361/201527055